3com 8 Manual Do Utilizador
7
Hub Connections
Depending on what ports your hub has, you can use either
10BASE-T or 10BASE-2 to connect your hubs together:
10BASE-T or 10BASE-2 to connect your hubs together:
■
With 10BASE-2 you can connect up to 30 hubs on a
single segment, leaving all of the 10BASE-T ports free.
single segment, leaving all of the 10BASE-T ports free.
■
With 10BASE-T you can connect up to four hubs in
series.
series.
10BASE-2
To connect additional hubs using 10BASE-2 (Hub 4C and 8C
only), you need (as shown in Figure 2):
only), you need (as shown in Figure 2):
■
One 10BASE-2 50 Ohm cable for each additional hub.
The minimum cable length you can use is 0.5m (1.6ft).
The maximum segment length is 185m (607ft).
The minimum cable length you can use is 0.5m (1.6ft).
The maximum segment length is 185m (607ft).
■
One 10BASE-2 ‘Y’ piece for each hub. You can use ‘T’
pieces but ‘Y’ pieces provide optimal clearance of the
other ports.
pieces but ‘Y’ pieces provide optimal clearance of the
other ports.
■
Two 10BASE-2 50 Ohm terminators (end pieces).
Figure 2 Some of the 10BASE-2 Equipment You May Need
10BASE-T
If you have additional hubs you want to connect using
10BASE-T, you need:
10BASE-T, you need:
■
One straight-through TP cable for each extra hub.
Twisted Pair (TP) Cables
To connect your workstations and hubs, you must use
straight-through TP cable with RJ-45 connectors. Cables can
be shielded (screened) or unshielded; we recommend that
you use shielded. The maximum length you can use is 100m
(328ft). A straight-through cable is one where the pins of
one connector are connected to the same pins of the other
connector.
straight-through TP cable with RJ-45 connectors. Cables can
be shielded (screened) or unshielded; we recommend that
you use shielded. The maximum length you can use is 100m
(328ft). A straight-through cable is one where the pins of
one connector are connected to the same pins of the other
connector.
Terminator
(end piece)
‘Y’ piece
or
‘T’ piece
3C16700.book Page 7 Tuesday, July 13, 1999 9:59 AM